Function start_cooldown_in_slot 

pub(crate) fn start_cooldown_in_slot(
    program: &CombatProgram,
    state: &mut CombatInstance,
    recovery_local: LocalSpellIdx,
    slot_local: LocalSpellIdx,
    now: SimTime,
) -> u32

Start slot_local’s cooldown timers using recovery_local’s own recovery data.

An aura-332 action replacement shares the base action’s slot but keeps its own recovery time.